/**
 * Copyright (c) 2012-2017, www.tinygroup.org (luo_guo@icloud.com).
 * <p>
 *  Licensed under the GPL, Version 3.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 * <p>
 *       http://www.gnu.org/licenses/gpl.html
 * <p>
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.tinygroup.distributed;

import org.springframework.beans.factory.InitializingBean;
import org.tinygroup.commons.tools.Assert;
import org.tinygroup.commons.tools.StringUtil;
import org.tinygroup.sequence.impl.DefaultSequence;
import org.tinygroup.sequence.impl.DefaultSequenceDao;
import org.tinygroup.tinydb.dialect.impl.MySQLDialect;

/**
 * 单数据源方式获取分布式主键值
 * @author renhui
 *
 */
public class SingleDistributedMySQLDialect extends MySQLDialect implements
		InitializingBean {

	private String sequenceName;// 分布式序列名称

	private DefaultSequence defaultSequence;

	private int step;// 每次缓存的步长
	

	public void setSequenceName(String sequenceName) {
		this.sequenceName = sequenceName;
	}

	public void setStep(int step) {
		this.step = step;
	}

	@Override
	public int getNextKey() {
		return new Long(defaultSequence.nextValue()).intValue();
	}

	@Override
	public void afterPropertiesSet() throws Exception {
		Assert.assertNotNull(getDataSource(), "datasource must not null");
		Assert.assertTrue(!StringUtil.isBlank(sequenceName),
				"sequenceName must not null or empty");
		DefaultSequenceDao sequenceDao = new DefaultSequenceDao();
		sequenceDao.setDataSource(getDataSource());
		if (step > 0) {
			sequenceDao.setStep(step);
		}
		defaultSequence = new DefaultSequence();
		defaultSequence.setSequenceDao(sequenceDao);
		defaultSequence.setName(sequenceName);
	}

}
